Unable to send with Sendmail

[Vishnu V. Krishnan]

On Wed, 2018-08-15 at 10:42 +0200, René J.V. Bertin wrote:
> On Wednesday August 15 2018 00:39:56 Vishnu V. Krishnan wrote:
> 
> >    E-Mail Sending Failed
> >    Failed to transport message. Failed to execute mailer program /usr/bin/
> > msmtp --account=<account_name>
> 
> Probably an open door, but are you certain that it doesn't try to execute an
> executable called " /usr/bin/msmtp --account=<account_name>" (= if you don't
> have a quote in a wrong location).
> 

I did not use any quotes when I put that in the relevant field. Should I have?

This is in Settings > Accounts > Sending > Add > Sendmail